A group of researchers followed 10 firms from 2010 to 2022 to determine the effect of new tax policies on firms' performance: Firm ID = 1,...,10 Year = 2010,...,2022 I2010 = Investment during year in 2010 ... I2022 = Investment during year in 2022 F2010 = Real Value of the Firm in 2010 ... F2010 = Real Value of the Firm in 2022 What type of data set is this?

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